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Classification Of Metamorphic Rocks

Metamorphic rocks have been variously classified on the basis of texture and structure, degree of metamorphism, mineralogical composition and mode of origin etc.


Classification Of Metamorphic Rocks

 

     Metamorphic rocks have been variously classified on the basis of texture and structure, degree of metamorphism, mineralogical composition and mode of origin etc.

 

      A very general two-fold classification based on the presence or absence of layered structure or

 

FOLIATION as defined above is as follows:

 

(a) Foliated Rocks

 

     All metamorphic rocks showing development of conspicuous parallelism in their mineralogical and structural constitution falling under the general term foliation are grouped together as foliated rocks.

 

      The parallelism indicating features include slaty cleavage, schistosity and gneissose structures

 

         Typical rocks included in this group are slates, phyllites, schists and gneisses of great variety.

 

(b)Non-Foliated Rocks

 

Included in this group are all those metamorphic rocks characterised with total or nearly total absence of foliation or parallelism of mineralogicaJ constituents.

 

Typical examples of non-foliated rocks are quartzites, hornfels, marbles, amphibolites and soapstone etc.

 

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